Apparatus for admitting air to furnaces.



C. SCHNEIDER. APPARATUS FOR ADMITTIN'GAIR T0 FURNACES.

APPLICATION FILED MAR. 9. 19M.

mamms I mwmwegr a 614mm s -ITNESE CHRISTIAN SCHNEIDER, OF SHEFFIELD, ENGLAND,

APPARATUS FOR ADMITTIN' Gr AIR TO FURNACES.

Specification of Letters Patent.

Application filed March 9, 1914. Serial N 0. 823,494.

To all whom it may concern:

Be it known that I, CHRISTIAN SCHNEIDER, of the city of Sheffield, in the county of Yorkshire, England, have invented certain new and useful Improvements in Apparatus for Admitting Air to Furnaces, of which the following is the specification.

The invention-relates to an apparatus in the form of an attachment to a furnace door for controlling the admission of air to steam boiler furnaces and the objectv of the invention is to provide as an attachment to a furnace door a simply constructed efiicient and reliable smoke consuming apparatus designed to automatically opento admit air to the furnace upon the door being opened and to require the attention and services of the stoker to throw it out of action when no further air draft is required.

With the above objects in view the invention consists essentially in a furnace door having a plurality of air apertures therein, a shutter slidably mounted on the door and fitted with corresponding air apertures, a latch pivotally secured to the door and to the shutter and a catch engageable with the latch and secured to the front plate of the furnace, the parts being arranged and constructed as hereinafter more particularly described and later pointed out in the appended claim.

Figure 1 represents an end vlew of a portion of a boiler with my invention applied.

Fig. 2 represents an enlarged detailed plan view of the door and attached shutter.

Fig. 3 represents a vertical sectional view centrally through the door and shutter.

Fig. 1 represents a side view of the catch.

In the drawing like characters of reference indicate corresponding parts in each figure.

1 represents the usual boiler front and 2 the end front plate of the furnace which front plate is supplied with the usual firing opening normally closed by the door 3. The door is hinged as is usual at 4 to the front plate.

5, 6 and 7 are horizontal paralleled air inlet apertures formed in the door which apertures are spaced by intervening cross pieces 8 and 9 these cross pieces being preferably of the same width as the apertures and formed as part of the door.

10 represents a substantially rectangular shutter vertically slidable between guides 11 and 12 cast as part of the door.

The shutter is fitted with two horizontally disposed and paralleled air apertures 13 and 1 1 of the same width and length as the apertures 5, 6 and7.

Theshutter is designed to rest normally on a ledge 15 cast as part of the door and in this position of the shutter the apertures 13 and 14 register with 5 and .6 While the aperture 7 is entirely free of the upper edge of shutter. Accordingly when the shutter is down-so to speak air is passed into the furnace through the openings 5, 6 and 7. Inthe upper positionv of the shutter the body of the shutter is designed to close the apertures 5, 6 and 7. l 16 is a latch having one end pivotally se cured at 17 to the door and the opposite end passlng slidably behind a suitable guide strap 16 fastened to the door.

The body of the latch is fastened 18 centrally to the shutter.

19 is a catch or hook screw threaded into the front plate 2 at the side of the door opposite the hinge.

The end of the latch adjoining the catch is offset upwardly and then outwardly in the form .of an inverted l. as at 20 thereby forming a striking lip for the stoker.

The latch and catch are arranged such that when the latch is below the catch as shown in the drawings with the door resting on the ledge, air is freely admitted to the furnace through the apertures 5, 6 and 7 and when the latch is above the catch and rest ing on it the shutter is raised so that the ap ertures 5, 6 and 7 are closed by the body of the shutter.

With this device applied on a furnace door and considering the latch initially resting on the catch it will be seen that it is impossible for the stoker to fire without opening the apertures 5, 6 and 7 as the instant the latch is raised off the catch and the door opened the shutter will drop by gravity and in so doing open the apertures 5, 6 and 7. Accordingly when the door is again closed after firing air will be admitted to the furnace and will continue to enter until such time as the stoker opens the door sufliciently to allow the latch to be raised and replaced on top of the catch.

It is here explained that customarily the stoker will use his shovel to manipulate the door and for this reason the striking lip has been provided. In opening the door this lip will be hit by the shovel.

by a pin Patented Get. 23, 191i 7.

It is explained that if the stoker'forgets to raise the latch a short time after he has fired no harm will be done as the smoke will be consumed, there being simply a loss of heat units. A great feature ofthe invention is that no smoke will emanate from the furnace flue after firing, as firing cannot be done without automatically opening the shutter and admitting air for combustion purposes to the furnace.

What I claim as my invention is: V

The combination with a suitably pivoted furnace door having a plurality of horizontally disposed parallel air inlet apertures i therein, vertically disposed guides carried by the door and at the ends of the apertures and a shutter vertically slidable in the guides,

said shutter being provided with a plurality of spaced parallel horizontal air inlet apertures correspond to 'the apertures in the door, of a ledge PIOJGCtlIIg from the lower vpart of the door and stoppingand support- Copies of this patent may be obtained for 'ing beyond the free end ing the shutter in the lowermost position and with the apertures in the door and shutter registering, a latch crossing the shutter and pivotally secured centrally thereto and having one end pivotally fastened to the pivoted end of the door and the other end projectof the door and provided with an outstanding striking lip, said latch having the free end thereof lower than the pivoted end in the lower position of the shutter, a stationary catch for the latch ad- 'jacent the free edge of the door and posi tioned above the latch in the lower position of the shutter and a guide the free end of the door latch.

Signed at tober, 1913. 4

CHRISTIAN SCHNEIDER. In the presence of f G. S. ROXBURGH, S. SILVERT.

and crossing the Winnipeg this 14th day r Oc- Washington, D, G.

strap secured to 1 five cents each, by addressing the Commissioner ct Patents; 1 

